From patchwork Mon Dec 11 23:42:57 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Srinivas Kandagatla X-Patchwork-Id: 121476 Delivered-To: patch@linaro.org Received: by 10.140.22.227 with SMTP id 90csp3430781qgn; Mon, 11 Dec 2017 15:45:28 -0800 (PST) X-Google-Smtp-Source: ACJfBoueeEuq2CztDR0Pcx9Etw9pLpmdD59tl4ryXjigC8MFTpP7bi2lISi/ccD3O7ANDM1ihZJ2 X-Received: by 10.99.136.198 with SMTP id l189mr226244pgd.307.1513035928598; Mon, 11 Dec 2017 15:45:28 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1513035928; cv=none; d=google.com; s=arc-20160816; b=yAwn/bCrfeJjRtBwtoIK/hHT+Tor1hWahh6NuM2bamv6MJoqdrVREhZMVTEa6p94f8 H0155RI3VA1q5L6CeZ/dU8+f8BrxhqQ6GjIDvG7MFH+8RT388bAAY4hOfPG7FhzbQYzA bG7yw8gwe/VGqNHB+hPPYUKJs+OK7kh6Sh2JmxCAnpel3DE1rTQnBlWsrFWVoJsjKht9 XjyTPaCOg6JjfBUtzkrgwKsUzmIZkn9YZR7h40fVo8leYH7ABFfkGfPKYUrHnsnmHYJO pAQECqq7MSA+Zk0g3p9JJm8wDjYs0FzlnXs9WeVgs2Lp/cU5QoFs2f9eCu2Qxpvk5cev u/2g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=PG/i7YD51upogrZTbvSYd+Xyc4fPn1VkXGB4LoFCp2A=; b=vZgOtqdAXhgfHm3SerPPe0qTM2GyMF842qvZPqpLsqxduVuSItflhk0dRxcR5vOVG9 C4uzC9Gy3Um8tBxhsUh7YB4rgdQWpBp9fWeNPngYJWvYHfz03h5K+MURXWo4g0Ircwr/ HXXoY8/MXS0TtZSGkPeXw30ux/O2QQJH5DgFmXYdGs0dkDPtl1NtKESRHqFKP8guD+bB /OvrA0UXlDpMLSKdBxVcluXk7J+D3oX8vbd+UDyssdBjdhVhT8oekLjWmRWJXdq2iizg kqot21saaH5bOR7eqQfyPzw/cUbmfDLlRtplbZlRrosu1pRe2nwBheK4xzYKDCk8GwE5 eb1g== ARC-Authentication-Results: i=1; mx.google.com; dkim=neutral (body hash did not verify) header.i=@linaro.org header.s=google header.b=ZpCbNuEQ; spf=pass (google.com: best guess record for domain of linux-arm-msm-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-arm-msm-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id u73si11754108pfi.245.2017.12.11.15.45.28; Mon, 11 Dec 2017 15:45:28 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-arm-msm-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@linaro.org header.s=google header.b=ZpCbNuEQ; spf=pass (google.com: best guess record for domain of linux-arm-msm-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-arm-msm-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752447AbdLKXp1 (ORCPT + 10 others); Mon, 11 Dec 2017 18:45:27 -0500 Received: from mail-wm0-f68.google.com ([74.125.82.68]:33998 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752292AbdLKXpT (ORCPT ); Mon, 11 Dec 2017 18:45:19 -0500 Received: by mail-wm0-f68.google.com with SMTP id y82so15194117wmg.1 for ; Mon, 11 Dec 2017 15:45:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=K4hLTxhi2C8qQI8n9dPzRgcQq2zG7lB/Uole40iz+cQ=; b=ZpCbNuEQ/DQQ8tQLqxJ58SdsVXbErPPmdnvyq3cThqiMEULeaIBYYt7U5SVoB4ptGW erNTVIOHgDYXkX43LT4trZDI8VKwTUUQMdApM6WBjdc8+8K8flVdhPcDATVaZg9opKeG NFQBKNNR60aC4u1JGF/zNmRsRkvtAbBEHF6HA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=K4hLTxhi2C8qQI8n9dPzRgcQq2zG7lB/Uole40iz+cQ=; b=CZa6ptsQZyxNDtis3VNkkT2MVAoo3F/xSNNLEXgZXiYShip+17QGm06R0PNoOES3WV 6ywul0J8kIj/273gSbgVHtal8uSy5RPXGZRIKWpKmbsBNhXoOycPzej1KVSthYgOZeND MNh9jMvsO0fi2LeFwqg3QLJRCXNsW0yv+Sum/+w5HgtPpBrXjEWuVcFUy9bnUM3w1Txg Md+ZCRjWl6FCAfVfy5/YhAtW63lzLvGryGlO+jokdk/xdERmQrMV1dcAEP3+3jsMvGrC ZlvilqWA+u09zsWBIj22LMajDa3QEe+en93O43hAQWfpPD9/qOS1t/g3je2bXpvNKqRk xLMg== X-Gm-Message-State: AKGB3mKQj6I7Wo9HOuMnaohcMaJ2VpiPBQxedLLpHIQ0jn8KpUfH2pCa 0DoVbKjEz/B0IHfArrlbwePB8A== X-Received: by 10.28.35.4 with SMTP id j4mr19368wmj.55.1513035917876; Mon, 11 Dec 2017 15:45:17 -0800 (PST) Received: from localhost.localdomain (cpc90716-aztw32-2-0-cust92.18-1.cable.virginm.net. [86.26.100.93]) by smtp.gmail.com with ESMTPSA id k69sm10673615wmg.8.2017.12.11.15.45.16 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 11 Dec 2017 15:45:17 -0800 (PST) From: srinivas.kandagatla@linaro.org To: Mark Brown , Greg Kroah-Hartman , alsa-devel@alsa-project.org Cc: sdharia@codeaurora.org, Rob Herring , Mark Rutland , Jonathan Corbet , pombredanne@nexb.com, j.neuschaefer@gmx.net, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Srinivas Kandagatla Subject: [PATCH v10 03/13] slimbus: Add SLIMbus bus type Date: Mon, 11 Dec 2017 23:42:57 +0000 Message-Id: <20171211234307.14465-4-srinivas.kandagatla@linaro.org> X-Mailer: git-send-email 2.15.0 In-Reply-To: <20171211234307.14465-1-srinivas.kandagatla@linaro.org> References: <20171211234307.14465-1-srinivas.kandagatla@linaro.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Sagar Dharia SLIMbus (Serial Low Power Interchip Media Bus) is a specification developed by MIPI (Mobile Industry Processor Interface) alliance. SLIMbus is a 2-wire implementation, which is used to communicate with peripheral components like audio-codec. SLIMbus uses Time-Division-Multiplexing to accommodate multiple data channels, and control channel. Control channel has messages to do device-enumeration, messages to send/receive control-data to/from SLIMbus devices, messages for port/channel management, and messages to do bandwidth allocation. The framework supports multiple instances of the bus (1 controller per bus), and multiple slave devices per controller. This patch adds support to basic silmbus core which includes support to SLIMbus type, slimbus device registeration and some basic data structures. Signed-off-by: Sagar Dharia Signed-off-by: Srinivas Kandagatla --- drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/slimbus/Kconfig | 17 ++++++ drivers/slimbus/Makefile | 6 +++ drivers/slimbus/core.c | 108 +++++++++++++++++++++++++++++++++++++ include/linux/mod_devicetable.h | 13 +++++ include/linux/slimbus.h | 116 ++++++++++++++++++++++++++++++++++++++++ 7 files changed, 263 insertions(+) create mode 100644 drivers/slimbus/Kconfig create mode 100644 drivers/slimbus/Makefile create mode 100644 drivers/slimbus/core.c create mode 100644 include/linux/slimbus.h -- 2.15.0 -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/Kconfig b/drivers/Kconfig index 152744c5ef0f..c8e1d1c3f426 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -211,4 +211,6 @@ source "drivers/mux/Kconfig" source "drivers/opp/Kconfig" +source "drivers/slimbus/Kconfig" + endmenu diff --git a/drivers/Makefile b/drivers/Makefile index 1d034b680431..d233a95b3b24 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -87,6 +87,7 @@ obj-$(CONFIG_MTD) += mtd/ obj-$(CONFIG_SPI) += spi/ obj-$(CONFIG_SPMI) += spmi/ obj-$(CONFIG_HSI) += hsi/ +obj-$(CONFIG_SLIMBUS) += slimbus/ obj-y += net/ obj-$(CONFIG_ATM) += atm/ obj-$(CONFIG_FUSION) += message/ diff --git a/drivers/slimbus/Kconfig b/drivers/slimbus/Kconfig new file mode 100644 index 000000000000..9b6bb84d66ed --- /dev/null +++ b/drivers/slimbus/Kconfig @@ -0,0 +1,17 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# SLIMbus driver configuration +# +menuconfig SLIMBUS + tristate "SLIMbus support" + help + SLIMbus is standard interface between System-on-Chip and audio codec, + and other peripheral components in typical embedded systems. + + If unsure, choose N. + +if SLIMBUS + +# SLIMbus controllers + +endif diff --git a/drivers/slimbus/Makefile b/drivers/slimbus/Makefile new file mode 100644 index 000000000000..506ff17d6346 --- /dev/null +++ b/drivers/slimbus/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for kernel SLIMbus framework. +# +obj-$(CONFIG_SLIMBUS) += slimbus.o +slimbus-y := core.o diff --git a/drivers/slimbus/core.c b/drivers/slimbus/core.c new file mode 100644 index 000000000000..02f5075a9309 --- /dev/null +++ b/drivers/slimbus/core.c @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2011-2017, The Linux Foundation + */ + +#include +#include +#include +#include +#include + +static const struct slim_device_id *slim_match(const struct slim_device_id *id, + const struct slim_device *sbdev) +{ + while (id->manf_id != 0 || id->prod_code != 0) { + if (id->manf_id == sbdev->e_addr.manf_id && + id->prod_code == sbdev->e_addr.prod_code) + return id; + id++; + } + return NULL; +} + +static int slim_device_match(struct device *dev, struct device_driver *drv) +{ + struct slim_device *sbdev = to_slim_device(dev); + struct slim_driver *sbdrv = to_slim_driver(drv); + + return !!slim_match(sbdrv->id_table, sbdev); +} + +static int slim_device_probe(struct device *dev) +{ + struct slim_device *sbdev = to_slim_device(dev); + struct slim_driver *sbdrv = to_slim_driver(dev->driver); + + return sbdrv->probe(sbdev); +} + +static int slim_device_remove(struct device *dev) +{ + struct slim_device *sbdev = to_slim_device(dev); + struct slim_driver *sbdrv; + + if (dev->driver) { + sbdrv = to_slim_driver(dev->driver); + if (sbdrv->remove) + sbdrv->remove(sbdev); + } + + return 0; +} + +struct bus_type slimbus_bus = { + .name = "slimbus", + .match = slim_device_match, + .probe = slim_device_probe, + .remove = slim_device_remove, +}; +EXPORT_SYMBOL_GPL(slimbus_bus); + +/* + * __slim_driver_register() - Client driver registration with SLIMbus + * + * @drv:Client driver to be associated with client-device. + * @owner: owning module/driver + * + * This API will register the client driver with the SLIMbus + * It is called from the driver's module-init function. + */ +int __slim_driver_register(struct slim_driver *drv, struct module *owner) +{ + /* ID table and probe are mandatory */ + if (!drv->id_table || !drv->probe) + return -EINVAL; + + drv->driver.bus = &slimbus_bus; + drv->driver.owner = owner; + + return driver_register(&drv->driver); +} +EXPORT_SYMBOL_GPL(__slim_driver_register); + +/* + * slim_driver_unregister() - Undo effect of slim_driver_register + * + * @drv: Client driver to be unregistered + */ +void slim_driver_unregister(struct slim_driver *drv) +{ + driver_unregister(&drv->driver); +} +EXPORT_SYMBOL_GPL(slim_driver_unregister); + +static void __exit slimbus_exit(void) +{ + bus_unregister(&slimbus_bus); +} +module_exit(slimbus_exit); + +static int __init slimbus_init(void) +{ + return bus_register(&slimbus_bus); +} +postcore_initcall(slimbus_init); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("SLIMbus core"); diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h index abb6dc2ebbf8..48e188327c02 100644 --- a/include/linux/mod_devicetable.h +++ b/include/linux/mod_devicetable.h @@ -452,6 +452,19 @@ struct spi_device_id { kernel_ulong_t driver_data; /* Data private to the driver */ }; +/* SLIMbus */ + +#define SLIMBUS_NAME_SIZE 32 +#define SLIMBUS_MODULE_PREFIX "slim:" + +struct slim_device_id { + __u16 manf_id, prod_code; + __u16 dev_index, instance; + + /* Data private to the driver */ + kernel_ulong_t driver_data; +}; + #define SPMI_NAME_SIZE 32 #define SPMI_MODULE_PREFIX "spmi:" diff --git a/include/linux/slimbus.h b/include/linux/slimbus.h new file mode 100644 index 000000000000..6b4ed290fbb0 --- /dev/null +++ b/include/linux/slimbus.h @@ -0,0 +1,116 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2011-2017, The Linux Foundation + */ + +#ifndef _LINUX_SLIMBUS_H +#define _LINUX_SLIMBUS_H +#include +#include +#include + +extern struct bus_type slimbus_bus; + +/** + * struct slim_eaddr - Enumeration address for a SLIMbus device + * @manf_id: Manufacturer Id for the device + * @prod_code: Product code + * @dev_index: Device index + * @instance: Instance value + */ +struct slim_eaddr { + u16 manf_id; + u16 prod_code; + u8 dev_index; + u8 instance; +} __packed; + +/** + * enum slim_device_status - slim device status + * @SLIM_DEVICE_STATUS_DOWN: Slim device is absent or not reported yet. + * @SLIM_DEVICE_STATUS_UP: Slim device is announced on the bus. + * @SLIM_DEVICE_STATUS_RESERVED: Reserved for future use. + */ +enum slim_device_status { + SLIM_DEVICE_STATUS_DOWN = 0, + SLIM_DEVICE_STATUS_UP, + SLIM_DEVICE_STATUS_RESERVED, +}; + +/** + * struct slim_device - Slim device handle. + * @dev: Driver model representation of the device. + * @e_addr: Enumeration address of this device. + * @status: slim device status + * @laddr: 1-byte Logical address of this device. + * @is_laddr_valid: indicates if the laddr is valid or not + * + * This is the client/device handle returned when a SLIMbus + * device is registered with a controller. + * Pointer to this structure is used by client-driver as a handle. + */ +struct slim_device { + struct device dev; + struct slim_eaddr e_addr; + enum slim_device_status status; + u8 laddr; + bool is_laddr_valid; +}; + +#define to_slim_device(d) container_of(d, struct slim_device, dev) + +/** + * struct slim_driver - SLIMbus 'generic device' (slave) device driver + * (similar to 'spi_device' on SPI) + * @probe: Binds this driver to a SLIMbus device. + * @remove: Unbinds this driver from the SLIMbus device. + * @shutdown: Standard shutdown callback used during powerdown/halt. + * @device_status: This callback is called when + * - The device reports present and gets a laddr assigned + * - The device reports absent, or the bus goes down. + * @driver: SLIMbus device drivers should initialize name and owner field of + * this structure + * @id_table: List of SLIMbus devices supported by this driver + */ + +struct slim_driver { + int (*probe)(struct slim_device *sl); + void (*remove)(struct slim_device *sl); + void (*shutdown)(struct slim_device *sl); + int (*device_status)(struct slim_device *sl, + enum slim_device_status s); + struct device_driver driver; + const struct slim_device_id *id_table; +}; +#define to_slim_driver(d) container_of(d, struct slim_driver, driver) + +/* + * use a macro to avoid include chaining to get THIS_MODULE + */ +#define slim_driver_register(drv) \ + __slim_driver_register(drv, THIS_MODULE) +int __slim_driver_register(struct slim_driver *drv, struct module *owner); +void slim_driver_unregister(struct slim_driver *drv); + +/** + * module_slim_driver() - Helper macro for registering a SLIMbus driver + * @__slim_driver: slimbus_driver struct + * + * Helper macro for SLIMbus drivers which do not do anything special in module + * init/exit. This eliminates a lot of boilerplate. Each module may only + * use this macro once, and calling it replaces module_init() and module_exit() + */ +#define module_slim_driver(__slim_driver) \ + module_driver(__slim_driver, slim_driver_register, \ + slim_driver_unregister) + +static inline void *slim_get_devicedata(const struct slim_device *dev) +{ + return dev_get_drvdata(&dev->dev); +} + +static inline void slim_set_devicedata(struct slim_device *dev, void *data) +{ + dev_set_drvdata(&dev->dev, data); +} +#endif /* _LINUX_SLIMBUS_H */